Gear.



H. L. HUDSON.

GEAR.

Patented Dec. 14, 1915.

APPLICATION FILED NOV. 30. 1914.

2 SHEETSSHEET HIHI COLUMBIA LANOCIRAPH CO.,WASHINGTON,D.C.

1 HUDSON.

Patented Dec. 14, 1915.

2SHEETS-SHEET'2.

may not only serve their function as com HARRISON L. HUDSON, 0F Cf-ICAGG, ILLINOIS.

GEAR.

Specification of Letters Fat-cut.

Patented Dec, 14a, 1215.

Application filed November 30, 114. Serial No. 874,924.

To all whom it may concern Be it known that I, l-Linnrsoiv Hnnson,citizen of the United States, resid ng at Chicago, in the county of Cookand State of Illinois, have invented a certain new and usefulImprovement in Gears, of which the following is a full, clear, concise,and exact description, reference being had to the accompanying drawings,forming a part of this specification.

My invention relates to power transm1ssion gears, one feature of theinvention having special relation to those gears in which the toothedportions are separated from but are movable with respect to the bodyportions and the invention is of particular service where soundinsulating cushioning material is interposed between the toothed andbody members of the gears to reduce or eliminate the noise due to gearoperation.

'A gear of this general class is disclosed by my United States Patent1,0%8,012, dated October 29, 1912, wherein I have shown a plurality ofguiding structures each made up of elements included in the formation ofa toothed ring and body portion of a gear, whereby these two gear partsare interlocked or interengaged in such a man ner as to preventundesirable circumferential movement between these two gear parts. Thetoothed ring of the gear is flexible so that it may be forced out of itstrue shape when encountering unusual load, and is resilient so that itmay automaticallyresume its true shape when the undue load is removed,the guiding means determining the direction in which the toothed ringmay flex when subject to undue load and may return when resuming normalshape. 7

In practising my present invention I provide another form ofmounting-for the coupling blocks and another form of construction forthe coupling lugs whereby they plements to the coupling blocks but mayalso be employed in carrying out another feature of my present inventionwherein the toothed rings are formed in segments which the coupling lugsunite. While the coupling lugs are thus employed in realizing bothfeatures of my invention, yetl do not wish to be limited to the doublefunction of these coupling lugs as the toothed ring of section, of agear constructed in v the gear may be. formed in segmental sections thatmay be united by other bonds than the aforesaid double functioningcoupling lugs.

I will explain my invention more fully by reference to the accompanyingdrawings showingthe preferred embodiment thereof as it is embraced in anexternally toothed spur gear, thoughv it is to be understood that I donot limit myself to a spur gear, nor to a gear that is externallytoothed.

Figure l is a View in elevation, partially in accordance withtheinvention; Fig. 2 is a sectional view on line 2 2 of Fig. 1; Fig. 3is a perspective view of a coupling lug; Fig. 4 is a perspective view ofa coupling block; and Fig. 5 is a perspective view, with parts brokenaway, illustrating the invention.

Like parts are indicated by similar char-' actors of referencethroughoutthe different figures.

Thebody portion 1 of the gear is illustrated as being of skeletonconstruction and is surrounded by a ring 2 which is provided with gearteeth 3 upon its outer periphery. The ring 2 is flexible so that it maybe forced out of its true circular shape and is resilient so that it mayautomatically resume its proper shape. A composite cushion is interposedbetween the body 1 and the ring 2, this composite cushion including asound deadening element 4 which is backed by springs 4 (which may bevariously formed and arranged) that are depressed by the sound deadeningmaterial whereby the springs due to their own resilience, will press thesound deadening material, preferably made offelt, outwardly to maintainit in constant engagement with the inner surface of the ring 2. Thesprings will follow the sound deadening material a as this materialcontracts so that no space will intervene between. the ring material Thetwo elements 4;, 4 of the composite cushion thus cooperate to constitutea sound deadening or insulating element and are together sufficientlyresilient to fill the changeable clearance between the gear elements 1and 2. The cushion will yield to permit the toothed ring to move withrespect to the axis ofrotation'of the body member 1 and transversely ofsuch axis, the clearance between the members 1 and 2 of the gear beingpreferably just .suliicient to permit the gear teeth of another gearthat 2 and the sound deadening mesh with the gear teeth 3 to have theirouter edges reach thepitch circle of the gear teeth 8 b which arranement the ears will 7 D b not become unmeshed althoughthe toothed ring 2is permitted to move away from the gear with which it is in mesh, whenthe teeth 3 encounter unusual opposition.

In order to prevent undesirable relative circumferential movement of themembers 4, 4 10f the composite cushion are divided into sections or setsthat intervene between adjacent lugs 5. The body member of the 'gearisprovided with radially alined channels? located transversely of the gearplane. There are desirably three such lug channels equidistant aroundthe gear. Each channel or recess 7 receives a radially disposed oralined coupling block 8 that is in free sliding fit with the channelside walls which thus cooperate with the engaging blocksv8 to preventundesirable circumferential movement relatively betweenthe members 1 and2 of the gear, there being clearance between the inner faces of theblocks 8 and the bot tom's ofthe channels 7 to permit of requiredflexure of the ring 2 as the lugs become interposed between the place ofunusual pressure upon the teeth 3 and the shaft 11 upon which the bodyportion of the gear is keyed. The toothed ring being sufficientlyflexible, the portion thereof that is immediately sub- .ject to'unusualpressure or load is moved toward the body of the gear withoutaccompanying undesirable circumferential motion owing to the guidestructure which I have provided. When the unusual load has been removedthe ring will automatically resume itsproper shape due toits'resiliency. The three coupling blocks are flexibly secured to thecoupling lugs by means of holding tongues 9 integrally formed with thelugs and extending transversely of the gear plane, these tongues beingsomewhat in the nature of cylindrical shafts which are received withincorrespondingly shaped recesses infthe blocks 8 which are thus adaptedto turn slightly upon the tongues 9 whereby the blocks 8 may be adaptedto their containing channels 7 without depending uponrefined accuracy ofconstruction of the lugs. Endwise movement ofthe coupling lugs 5 and thecoupling blocks'8 is prevented owing to the engagement of the end facesthereof with the insetting flanges 2 When the composite cushion composedof the elements 4, 4: is compressed consequent upon relative movementbetween the ring and body members of the gear, the coupling lugs 5 willmove radially of the gear Backing plates 12 may be interposed betweenthe sound deadening material and the springs 4- to protect the sounddeadening material against the wear of the springs there- 7 upon whenthe parts are relatively moved.

I will now fully describe that feature of my invention which is not tobe limited to the type of gear covered by my aforesaid patent and whichfeature embraces the subdivision of thetoothed ring inclusive of theflanges 2 thereof into a plurality of bonded segments, the couplerswhich are relied 7 upon to bond the segments being the insetting lugs 5that are positioned to bridge the plane defining the locality of theengage ment of the adjacent butt'faces of adjacent segments of the ring,The riveting pins 6 are located equaldistancesuponopposite sides of thisplane and the metal of'eachcoupling lug is equally distributed upon bothsides of such plane whereby the seg: ments of the ring are firmly boundtogether.

Then the gear is to be taken apart the pins 7 .i

6 are reduced at'their .endsand thereafter removed whereupon thesegments of the toothed ring may be separated-from. the. balance of thestructure. v Not only is this construction of advantagein disassemblingthe parts of the gearbut it is also of ad-j vantage in the initialmanufacture of the gear and replacement of tsparts.

While I have herein shown and particu larly described the preferredembodiment of my invention I do not wish to be limited to the precisedetails of construction shown, as changes may readily be made withoutdeparting from the spirit of my invention, ut Having thus described myinvention I claim as new and desire to secure byLetters,

Patent the following q 1. A gear including spaced apart toothed and bodymembers; and a guide structure having complemental portions that arepro, v ded upon said members, and which gu de their inner ends'extendingtransversely of the plane of the gear and coupling blocks movablyconnected with the lugs by said tongues and in sliding fit with channelsprovided in the body member of the gear, suflicient clearanceintervening between the .bottoms of the channels and the innermostfaces,of said blocks'to permit of the flexible movethe gear ment of the ringmember of the gear and the accompanying movementof the coupling lugs andblocks carried thereby.

2. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define between said memberstransversely of the axis of rotation, the toothed member or" the gearbeing of ring like formation and suifi ciently flexible to permit it tobe moved with respect to the body member of the gear at the part whereunusual load is encountered and being sufliciently resilient to permitit to resume its proper shape when the undue load is removed, theaforesaid guide structure portions being in the form of insettingcoupling lugs carried by the ring member oi and coupling blocks movablyconnected with the inner ends of the lugs, these blocks being in slidingfit with channels provided in the body member of the gear, suflicientclearance intervening between the bot toms of the channels and theinnermost faces of said blocks to permit of the flexible movement of thering member of the gear and the accompanying movement of the couplinglugs and blocks carried thereby. V

3. A gear including spaced apart toothed and body members; and a guidestructure having complemental vided upon said members, and which guidestructure serves to define relative movement between said memberstransversely of the axis of rotation, the toothed member of the gearbeing of ring like formation and sufliciently flexible to permit it tobe moved with respect to the body member of the gear at the part whereunusual load-is encountered and being sufficiently resilient to permitit to resume its proper Shape when the undue load is removed, theaforesaid guide structure portions being in the form of coupling lugshaving tongues extending transversely of the plane of the gear andcoupling blocks movably connected with the lugs by said tongues and insliding fit with channels provided in the member of the gear companionto that carrying the lugs, sutficient clearance intervening between thebottoms of the channels and the adjacent faces of said blocks to permitof the flexible movement of the ring member of the gear. 7

4. A gear including spaced apart toothed Copies of this patent'may beobtained for relative movement carried by one portions that are pro- 7and body members; and a guide structure having complemental portionsthat are provided upon said members, and which guide structure serves todefine relative movement between said members transversely of the axisof rotation, the toothed member of the gear being of ring like formationand sufficiently flexible to permit it to be moved with respect to thebody member of the gear at the part where unusual load is encounteredand being sufliciently resilient to permit it to resume its proper shapewhen the undue load is removed, the aforesaid guide structure portionsbeing in the form of coupling lugs of the gear members and couplingblocks movably connected with the lugs, these blocks being in slidingfit with the gear member complemental to the one which carries the lugs,sufficient clearance intervening between the bottoms of the channels andthe adjacent faces of said blocks to permit of the flexible movement ofthe ring member of the gear.

5. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the guidestructure portions being in the form of coupling lugs carried by one ofthe gear members and coupling blocks movably connected with the lugs,these blocks being in sliding fit with the gear member complemental tothe one which carries the lugs.

6. A gear including spaced apart toothed and body members; and a guidestructure having complemental portions that are provided upon saidmembers, and which guide structure serves to define relative movementbetween said members transversely of the axis of rotation, the guidestructure portions being in the form of coupling lugs carried by one ofthe gear members and coupling blocks in tongue and groove connectionwith the lugs, these blocks being in sliding fit with the gear membercomplemental to the one which carries the lugs.

In witness whereof, I hereunto subscribe my name this nineteenth day ofNovember HARRISON L. HUDSON.

Witness:

ETTA L. WHITE.

five cents each, by addressing the Commissioner of Patents, Washington,D. G.

